@netkomm
Firstly, you need to put this question under b4i - this is the b4a forum. I will however assist you.
iOS 11 is a 64 bit environment.
So firstly make sure you have b4i v4.30 (Check in Help About)
Secondly, since it is a new device I presume that your bridge is still not loaded on it. If it was an upgrade you would have needed to delete the old bridge app.
Thirdly, go back to your IDE (b4i) and click Tools-->Build Server-->Server Settings. Next to "Debug Architecture" you have a choice of 32 bit or 64 bit - Choose 64 bit.
Now rebuild your Bridge App and all should be fine.
Enjoy building your apps.